Roberta Allen

I'm trying to find out information on my great aunt by the name of Roberta Allen.She died under other than normal cicumstances in Oakland, California in November 1922.Her husband of 3 or 4 months was always thought to have done it, but could never be proven. His name was Herman Albrecht, but nobody seems to know what happened to him. Roberta's sister (my grandmother) name was Meta Allen at the time and their father was Herbert Allen.